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Fair Value Measurements (Changes In Level 3 Assets And (Liabilities) Measured At Fair Value On A Recurring Basis) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized |  |  |  | $ (4) |  |  | $ (4) |
Settlements |  | $ (3) |  | (5) | $ (25) |  | (20) |
Power [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Gains and losses attributable to changes in net derivative assets and liabilities, included in Operating Income |  | 7 |  | 1 | 26 |  | 16 |
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized |  |  |  |  | 1 |  |  |
Net Derivative Assets (Liabilities) [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Opening Balance |  | 3 |  | 21 | 1 |  | 13 |
Included in Income |  | 7 | [1] | 1 | (26) | [1] | (16) | [1]
Included in Regulatory Assets/Liabilities | [2] | (1) |  | (12) | 5 |  | (4) |
Purchases, (Sales) |  | 0 |  | 0 | 0 |  | 0 |
Issuances (Settlements) | [3] | (3) |  | (5) | (25) |  | (20) |
Transfers In (Out) | [4] | 0 |  | 0 | (1) |  | 0 |
Closing Balance |  | 6 |  | 5 | 6 |  | 5 |
Net Derivative Assets (Liabilities) [Member] | Power [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Opening Balance |  | 2 |  | 11 | 6 |  | 11 |
Included in Income |  | 7 | [1] | 1 | (26) | [1] | (16) | [1]
Included in Regulatory Assets/Liabilities | [2] | 0 |  | 0 | 0 |  | 0 |
Purchases, (Sales) |  | 0 |  | 0 | 0 |  | 0 |
Issuances (Settlements) | [3] | (3) |  | (5) | (25) |  | (20) |
Transfers In (Out) | [4] | 0 |  | 0 | (1) |  | 0 |
Closing Balance |  | 6 |  | 7 | 6 |  | 7 |
Net Derivative Assets (Liabilities) [Member] | PSE And G [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Opening Balance |  | 1 |  | 10 | (5) |  | 2 |
Included in Income |  | 0 | [1] | 0 | 0 | [1] | 0 | [1]
Included in Regulatory Assets/Liabilities | [2] | (1) |  | (12) | 5 |  | (4) |
Purchases, (Sales) |  | 0 |  | 0 | 0 |  | 0 |
Issuances (Settlements) | [3] | 0 |  | 0 | 0 |  | 0 |
Transfers In (Out) | [4] | 0 |  | 0 | 0 |  | 0 |
Closing Balance |  | $ 0 |  | $ (2) | $ 0 |  | $ (2) |
[1] | PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $7 million and $26 million in Operating Income for the three months and six months ended June 30, 2017, respectively. Of the $7 million in Operating Income, $4 million is unrealized. Of the $26 million in Operating Income, $1 million is unrealized.
[2] | Mainly includes gains/losses on PSE&G’s derivative contracts that are not included in either earnings or Accumulated Other Comprehensive Income, as they are deferred as a Regulatory Asset/Liability and are expected to be recovered from/returned to PSE&G’s customers.
[3] | Represents $(3) million and $(25) million in settlements for the three months and six months ended June 30, 2017, respectively.
[4] | During the three months ended June 30, 2017 there were no transfers in to or out of Level 3. During the six months ended June 30, 2017, $(1) million of net derivatives assets/liabilities were transferred from Level 2 to Level 3. There were no transfers in to or out of Level 3 during three months and six months ended June 30, 2016.

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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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